Foldable portable telephone with improved antenna gain

Abstract: A foldable portable telephone is made up of an upper casing having a receiver portion, and a lower casing having a transmitter portion. The lower casing is rotatably connected to the upper casing by a hinge. When the lower casing is rotated away from the upper casing, the receiver portion is moved to protrude from the upper casing. At this instant, the telephone is brought into an off-hook state. When the lower casing is rotated onto the upper casing, the receiver portion is retracted into the upper casing while the telephone is brought into an on-hook state. The receiver portion, when protruded from the upper casing, increases the distance between an antenna and the user's ear. In this condition, the antenna is not influenced by the user's body and, therefore, maintains a sufficient antenna gain.

Description: The present invention relates to a portable radio communication apparatus and, more particularly, to a foldable portable telephone having an improved antenna gain and operability. A portable telephone of the type described usually has an upper casing, lower casing, and antenna. The problem with this kind of telephone is that the antenna is close to the user's ear since it protrudes from the top of the telephone, as will be described later specifically. In this condition, the antenna gain is lowered due to the influence of the user's body. Another problem is that the telephone cannot be brought into an off-hook state in interlocked relation to the movement of the lower casing away from the upper casing. Specifically, in the event of a conversation, the user has to open the lower casing away from the upper casing and then set up the off-hook state. In the specification of United States Patent Specification number 5,260,998, there is described a foldable portable telephone having a first flat segment housing a microphone and a switching unit, a second flat segment which houses a display unit and is hingedly connected to the first flat segment, and a third flat segment jointed pivotally to the second flat segment and housing an earphone. In use the second flat segment is extended in one direction so as to form an obtuse angle between the first and second flat segments, and the third flat segment is extended in the opposite direction so as to form an obtuse angle between the second and third flat segments, in order that, when the earphone is set to the ear, the microphone is located near to the user's mouth. A feature of a portable foldable telephone to be described below, by way of example, in illustration of the invention, is that it reduces the influence of the user's body on an antenna and goes off-hook automatically when a casing thereof is unfolded. A particular embodiment of a telephone to be described includes an upper casing having a receiver portion, and a lower casing having a transmitter portion. The lower casing is rotatably connected to the upper casing by a hinge. When the lower casing is rotated away from the upper casing, the receiver portion is moved to protrude from the upper casing. At this instant, the telephone is brought to an off-hook state. When the lower casing is rotated onto the upper casing, the receiver portion is retracted into the upper casing while the telephone is brought to an on-hook state. The receiver portion, when protruded from the upper casing, increases the distance between an antenna and the user's ear. In this condition, the antenna is not influenced by the user's body and, therefore, maintains a sufficient antenna gain. In addition, since the telephone goes off-hook automatically when the casing is unfolded, the user is free from troublesome manipulation. The following description and drawings disclose the operation of a conventional paging receiver and, by means of examples, the invention which is charactrised in the appended claims, whose terms determine the extent of protection conferred hereby. In the drawings:- Fig. 1 is a perspective view of a conventional foldable portable telephone; Figs. 2A is a plan view of a foldable portable telephone embodying the present invention; Figs. 2B and 2C are side elevations showing the embodiment in an unfolded position and a folded position, respectively; Fig. 3 is a section of a receiver portion included in the embodiment; Fig. 4A is a plan view showing a second embodiment of the present invention; Figs. 4B and 4C are side elevations showing the second embodiment in an unfolded position and a folded position, respectively; Fig. 5A is a plan view of a third embodiment of the present invention; Figs. 5B and 5C are side elevations showing the third embodiment in an unfolded position and a folded position, respectively; Figs. 6A and 6B are plan views each showing a specific modification of the third embodiment; and Fig. 7 is a side elevation showing a fourth embodiment of the present invention. In the figures, the same or similar constituent parts are designated by the same reference numerals. To better understand the present invention, a brief reference will be made to a conventional foldable portable telephone, shown in Fig. 1. As shown, the telephone has a first casing 28 and a second casing 21. A transmitter portion 22, having a microphone thereinside, and keys 23 are arranged on the second casing 21. The first casing 28 is rotatably connected to the second casing 21 by a hinge 24. A receiver portion 25, having a speaker thereinside, is included in the first casing 28. To fold the telephone, the casing 28 is rotated about the hinge 24 from a position H to a position G until the former contacts the latter, as indicated by an arrow in the figure. In such a folded position, the telephone is easy to carry. Conversely, to unfold the telephone, the casing 28 is rotated from the position G to the position H so as to locate the receiver portion 25 at the upper portion of the entire telephone. Subsequently, an antenna 26 is extended from the casing 28, and then a power key 27 is pressed. In this condition, the telephone allows a conversation to be held thereon. However, the conventional telephone having the above configuration suffers from a decrease in antenna gain due to the user's body and is troublesome to operate, as discussed earlier. Referring to Figs. 2A-2C, a first embodiment the foldable portable telephone in accordance with the present invention will be described. As shown, the telephone has a casing 1 made up of an upper casing la and a lower casing 1b. A receiver portion 2, a display 3 and keys 4 are provided on the upper casing la while a transmitter portion 5 is provided on the lower casing 1b. The lower casing 1b is rotatably connected to the lower end of the upper casing la by a hinge 1c. Magnets 10a and 11 are respectively built in the casings la and 1b, so that the casings la and 1b in a folded position will not be unfolded by accident. To unfold the casings la and 1b, a switch, not shown, is operated to cause the magnets 10a and 11 to slide. In the illustrative embodiment, the casings la and 1b are held in a folded position by magnets of opposite polarities; when the . magnets are displaced, the casings la and 1b are unfolded due to repulsion acting between the same polarities. When the casings 1a and 1b are unfolded, the receiver portion 2 protrudes from the casing la automatically, as shown in Fig. 2B. Conversely, the receiver portion 2 is retracted into the casing 1a when the casings la and 1b are folded. A mechanism for so moving the receiver portion 2 is disposed in the receiver portion 2. Specifically, as shown in Fig. 3, the receiver portion 2 is rotatably connected at one end thereof to the upper casing la by a pin 10. A flat actuator 7 extends out from the intermediate portion of the receiver portion 2 for selectively turning on or turning off an hook switch 8, as will be described later. The other end of the receiver portion 2 is implemented as a stop 12 which limits the movement of the receiver portion 2. The receiver portion 2 is constantly biased by a spring 2 in the direction in which it protrudes from the casing 1a. In operation, assume that the lower casing 1b is rotated from a folded position shown in Fig. 2C to an unfolded position shown in Fig. 2B, as indicated by an arrow B in the Fig. 2B. Then, the receiver portion 2 rotates about the pin 10 due to the action of the spring 6 until it protrudes from the upper casing 1a. As a result, the actuator 7, pressing the hook switch 8, is released from the switch 8. The hook switch 8 holds the telephone in an on-hook state when pressed by the actuator 7 or brings it into an off-hook state when released from the actuator 7. Hence, in the position shown in Fig. 2B, the telephone allows the user to answer an incoming call or originate a call. In addition, the receiver portion 2, protruding from the upper casing 1a, increases the distance between an antenna 9 and the user's ear. When the lower casing 1b is rotated from the unfolded position to the folded position, as indicated by an arrow A in Fig. 2B, it urges the receiver portion 2 into the upper casing 1a. As a result, the receiver portion 2 is rotated about the pin 10 until it has been fully retracted into the upper casing 1a. At the same time, the actuator 8 presses the hook switch 8 so as to bring it into an on-hook state. The two casings 1a and 1b are held in the folded position due to the magnets 10 and 11 which attract each other. In the illustrative embodiment, the transmitter portion 5 may be provided on the upper casing la, if desired. Figs. 4A-4C show a second embodiment of the present invention. As shown, this embodiment is essentially similar to the previous embodiment except that the keys 4 are provided on the lower casing 1b and that the upper casing 1 is opened from a position C to a position D, Fig. 4B. Referring to Figs. 5A-5C, a third embodiment of the present invention is shown. As shown, the casing 1 is also made up of the upper casing having the receiver portion 2, display 3 and keys 4, and the lower casing 1b having the transmitter portion 5. In this embodiment, the lower casing 1b is slidably connected to an accommodating portion 1d included in the upper casing 1.a. Assume that the lower casing 1b is slid from a position shown in Fig. 5C to a position shown in Fig. 5B, as indicated by an arrow F. Then, the receiver portion 2 protrudes from the upper casing 1a about the pin 10 under the action of the spring 6, as described with reference to Fig. 3. As a result, the actuator 7 is released from the switch 8 to set up an off-hook state. Again, the receiver portion 2, protruding from the upper casing la, increases the distance between the user's ear and the antenna 9 in the event of conversation. When the lower casing 1b is slid onto the accommodating portion 1d of the upper casing 1a in a direction E, it urges the receiver portion 2 into the casing 1a. Consequently, the receiver portion 2 is rotated about the pin 10 (Fig.3) and fully received in the upper casing 1a. At this time, the actuator 7 presses the switch 8 to set up an on-hook state. Fig. 6A shows a specific arrangement in which the display 3 and the keys 4 are respectively provided on the upper casing la and the lower casing 1b. Fig. 6B shows another specific arrangement in which both the display 3 and keys 4 are provided on the lower casing 1b. The transmitter 5 may be disposed in the upper casing la together with the receiver portion 2, if desired. Fig. 7 shows a fourth embodiment of the present invention. In this embodiment, a supersonic motor or similar electric drive source is built in the telephone in order to move the receiver portion 2 into and out of the upper casing la, as indicated by an arrow in the figure. The telephone is fuldable about the hinge 1c from a solid line position to a phantom line position, as also indicated by an arrow in the figure. In the illustrative embodiment, the antenna 9 is retractably mounted on the lower casing 1b. It will be understood that, although the invention has been illustrated by reference to particular examples, variations and modifications thereof, as well as other embodiments may be made within the scope of the protection afforded by the appended claims.

Claims: A foldable portable telephone including a casing (1), an antenna (9) extendible along an axis from the casing (1), the casing (1) having a first casing part (1a) incorporating a receiver portion (2) and a second casing part (1b), the first and second casing parts (1a)(1b) being connected together for relative movement, and the receiver portion (2) being rotatable with respect to the axis of the antenna about a pivot point (10)(1c), characterised in that the receiver portion (2) has a free end remote from the pivot (10)(1c), and in that there are means (1a,1b,1c,)(6) for causing the receiver portion (2) to protude from the casing (1) when the casing parts (1a) and (1b) are unfolded, the free end of the receiver portion (2) being rotatable about the pivot point (10)(1c) to define an acute open angle between the free end of the receiver portion (2) and the axis of the antenna (9). A portable telephone as claims in claim 1 including a hook switch which is actuated upon the rotation of the receiver portion (2) into the open angle position. A portable telephone as claimed in claim 1 or claim 2 including spring means for urging the receiver portion (2) into the open angle position. A portable telephone as claimed in any one of claims 1 to 3 in which the first and second parts (1a)(1b) are connected together for relative rotatable movement by a hinge (1c). A portable telephone as claimed in any one of claims 1 to 3 in which the first and second parts (1a)(1b) are connected together for relative linear slidable movement.

Inventors: NAGAI MICHIO, NAGAI, MICHIO, NAGAI, MICHIO, C/O NEC CORPORATION
Applicants: NIPPON ELECTRIC CO, NEC CORPORATION
Application year: 1994
Main classification: H04B1
IPC codes: H04B1, H04M1, H01Q1, H04Q7